Philips 32PF9968/10 Service Manual page 33

更多难得资料请到江南家电维修论坛免费下载！
http://bbs.520101.com
to "LCD". To change the display option code to "PDP" you
need to activate SDM via the service pads. Then change
the display option code blindly via a standard RC: key in the
code "062598" directly followed by the "MENU" button and
"XXX" (where XXX is the 3 digit decimal display option
code as mentioned in figure "Display option code
overview".
• Error 65 (DFI error). When this error occurs it means that
there is a problem with the I
MOP on the DFI panel.
5.6 The Blinking LED Procedure
5.6.1 Introduction
The blinking LED procedure can be split up into two situations:
• Blinking LED procedure in case of a protection. In this case
the error is automatically blinked. This will be only one
error, namely the one that is causing the protection.
Therefore, you do not have to do anything special, just read
out the blinks. A long blink indicates the decimal digit, a
short blink indicates the units.
• Blinking LED procedure in the "on" state. Via this
procedure, you can make the contents of the error buffer
visible via the front LED. This is especially useful for fault
finding, when there is no picture.
When the blinking LED procedure is activated in the "on" state,
the front LED will show (blink) the contents of the error-buffer.
Error-codes > 10 are shown as follows:
1. "n" long blinks (where "n" = 1 - 9) indicating decimal digit,
2. A pause of 1.5 s,
3. "n" short blinks (where "n"= 1 - 9),
4. A pause of approx. 3 s,
5. When all the error-codes are displayed, the sequence
finishes with a LED blink of 3 s,
6. The sequence starts again.
Example: Error 12 8 6 0 0.
After activation of the SDM, the front LED will show:
1. 1 long blink of 750 ms (which is an indication of the decimal
digit) followed by a pause of 1.5 s,
2. 2 short blinks of 250 ms followed by a pause of 3 s,
3. 8 short blinks followed by a pause of 3 s,
4. 6 short blinks followed by a pause of 3 s,
5. 1 long blink of 3 s to finish the sequence,
6. The sequence starts again.
5.6.2 How to Activate
Use one of the following methods:
• Activate the SDM or CSM. The blinking front LED will
show the entire contents of the error buffer (this works in
"normal operation" mode).
• Transmit the commands "MUTE" - "062500" - "OK"
with a normal RC. The complete error buffer is shown.
Take notice that it takes some seconds before the blinking
LED starts.
• Transmit the commands "MUTE" - "06250x" - "OK"
with a normal RC (where "x" is a number between 1 and
5). When x= 1 the last detected error is shown, x= 2 the
second last error, etc.... Take notice that it takes some
seconds before the blinking LED starts.
5.7 Protections
5.7.1 Software Protections
Most of the protections and errors use either the stand-by
microprocessor or the Mips controller as detection device.
Since in these cases, checking of observers, polling of ADCs,
Service Modes, Error Codes, and Fault Finding
2
C communication towards the
Q523.1U LA
filtering of input values are all heavily software based, these
protections are referred to as software protections.
There are several types of software related protections, solving
a variety of fault conditions:
• Protections related to supplies: check of the 12V, +5V,
+1V2, +1V4, 2V5 and +3V3.
• Protections related to breakdown of the safety check
mechanism. E.g. since the protection detections are done
by means of software, failing of the software will have to
initiate a protection mode since safety cannot be
guaranteed any more.
Remark on the Supply Errors
The detection of a supply dip or supply loss during the normal
playing of the set does not lead to a protection, but to a cold
reboot of the set. If the supply is still missing after the reboot,
the TV will go to protection.
Protections during Start-up
During TV start-up, some voltages and IC observers are
actively monitored to be able to optimize the start-up speed,
and to assure good operation of all components. If these
monitors do not respond in a defined way, this indicates a
malfunction of the system and leads to a protection. As the
observers are only used during start-up, they are described in
the start-up flow in detail (see paragraph "Stepwise Start-up").
5.7.2 Hardware Protections
The only real hardware protection in this chassis is in case of
an audio problem, the audio protection circuit will switch off
immediately the supply of the SSB. The supply will buzz during
the protection and +12VS drops to approx. 5.5 V, +5V Stand-
by to approx. to 1.9 V. Other indication of the audio protection
is that the red LED lights up only half.
Repair Tips
• It is also possible that you have an audio DC protection
because of an interruption in one or both speakers (the DC
voltage that is still on the circuit cannot disappear through
the speakers). Caution: (dis)connecting the speaker wires
during the ON state of the TV at high volume can damaged
the audio amplifier.
5.8 Fault Finding and Repair Tips
Read also paragraph "Error Codes" - "Extra Info".
5.8.1 Ambilight
Due to the degeneration process off the ambilights, it is
recommended to change both ambilight units in case one unit
needs to be repaired.
5.8.2 Audio Amplifier
It is recommended to replace all components at once 7D06,
7D09, 3D01, 3D25 when a defect FET 7D10 need to be fixed.
For the left channel (defect FET 7D35) of the audio amplifier
replace all components like 7D31, 7D34, 3D11, 3D28
5.8.3 CSM
When you activate CSM and there is a USB stick connected to
the TV, the software will dump the complete CSM content to the
USB stick. The file (Csm.txt) will be saved in the root of your
USB stick. If this mechanism works you can conclude that a
large part of the operating system is already working (Mips,
USB...)
5. EN 33